Sometimes just providing a clean deed and clearing up back-taxes is an "improvement", haha.
But with one exception, I've never even seen any property I have bought or sold. I have no emotional or mental bandwidth for all that it could take to do some of the improvements I get asked about (wells, septic, fencing, driveway, etc.), and I doubt that I'd get my money back. We have a simple, repeatable business model, and I don't want to add needless complexity at this stage.
The exception that I can imagine is if I ever bought a large parcel - say a 160 acre, and then subdivided it into 40s or 20s. But the economics would have to be really good to make me even think about that, especially at this stage of my business.
Out of curiosity, though, are there certain improvements your customers have asked you about or that you are considering? There may be considerations in different counties from mine that I am not thinking about.
Good luck - whatever you choose to do!